\begin{tikzpicture}
	\tkzDefPoints{0/0/A, 1.5/0/B}
	\tkzDrawLine[add=1.0 and 0.8](A,B)
	\tkzLabelLine[pos=1.8,right](A,B){$l$}
	\tkzLabelLine[pos=-0.5,above=.5em](A,B){I}
	\tkzLabelLine[pos=0.5, above=.5em](A,B){II}
	\tkzLabelLine[pos=1.4, above=.5em](A,B){III}
	\tkzDrawPoints[fill=black](A,B)
	\tkzLabelPoints[above](A,B)
\end{tikzpicture}

